Incredible host, very quick to respond and very helpful. The place itself is also very good. It’s very clean and located in quite neighborhood but not very far from Khao San road (20 minutes walk) and 30 minutes walk from Rathchathewi station. There is also a bus station nearby which helps you to get to BTS station. Take bus #79. Costs only 11 baht. There is also a food market near apartment (5 minutes walk) and food there is very cheap.
Next time I visit Bangkok I’ll definitely stay at Promboon’s place again!